S Persei

S Persei
Location of S Persei (circled) near the Double Cluster (north is left)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 2h 22m 51.70928s[1]
Declination 58° 31′ 11.4476″[1]
Apparent magnitude (V) +9.23[2] (7.9 - 12.0[3])
Characteristics
Spectral type M3 Iae–M7[3]
B−V color index +2.65[2]
Variable type SRc[3]
Astrometry
Radial velocity (Rv)-39.71[4] km/s
Proper motion (μ) RA: –0.49 ± 0.23[5] mas/yr
Dec.: −1.19 ± 0.20[5] mas/yr
Parallax (π)0.413 ± 0.017 mas[5]
Distance7,900 ± 300 ly
(2,420 ± 100 pc)
Absolute magnitude (MV)–6.36 (at mV 9.23)[2]
Details
Mass20[6] M☉
Radius1,298+64
−57[7] – 1,364±6[8] R☉
Luminosity123,000[9] – 186,000[10] L☉
Surface gravity (log g)0.0[11] cgs
Temperature3,000[12] – 3,600[10] K
Other designations
S Per, HD 14528, HIP 11093, BD+57°552, SAO 23261, WDS J02229+5835, AAVSO 0215+58
Database references
SIMBADdata

S Persei is a red supergiant or hypergiant located near the Double Cluster in Perseus, north of the cluster NGC 869. It is a member of the Perseus OB1 association and one of the largest known stars. If placed in the Solar System, its photosphere would engulf the orbit of Jupiter. It is also a semiregular variable, a star whose variations are less regular than those of Mira variables.

  1. ^ a b Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference levesque was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference famaey was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference asaki was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference yates was invoked but never defined (see the help page).
  7. ^ Norris, Ryan (2023). "Student Science at NMT: Learning Optical Interferometry Through Projects on Evolved Stars" (PDF). CHARA.
  8. ^ Norris, Ryan (2019). Seeing Stars Like Never Before: A Long-term Interferometric Imaging Survey of Red Supergiants (PhD thesis). Georgia State University. doi:10.57709/15009706.
  9. ^ Davies, Ben; Beasor, Emma R. (March 2020). "The 'red supergiant problem': the upper luminosity boundary of Type II supernova progenitors". MNRAS. 493 (1): 468–476. arXiv:2001.06020. Bibcode:2020MNRAS.493..468D. doi:10.1093/mnras/staa174. S2CID 210714093.
  10. ^ a b Cite error: The named reference fok was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference gonzalez was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference GarciaHernandez was invoked but never defined (see the help page).